Chapter 12
Q. 12.18
A variable-frequency sinusoidal voltage source is connected to the circuit in Fig. 12.11. The rms amplitude of the source is held at 10 V and the rms amplitude of the current entering the circuit is observed as the frequency of the source is varied from 1 to 500 kHz . What is the ratio of the rms current at 50 kHz to that at 300 kHz?
Step-by-Step
Verified Solution
The impedance equals 40 dB at 300 kHz and 20 dB at 50 kHz , so the impedance at 300 kHz is 20 dB above or ten times that at 50 kHz . Thus the rms current at 50 kHz is ten times that at 300 kHz .
